What is CVE-2026-4628?

CVE-2026-4628 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Improper Access Control. CVSS score: 4.3/10. Published 2026-03-23.

How severe is CVE-2026-4628?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Red Hat Build Of Keycloak

CVE-2026-4628

A flaw was found in Keycloak. An improper Access Control vulnerability in Keycloak’s User-Managed Access (UMA) resource_set endpoint allows attackers with valid credentials to bypass the allowRemoteResourceManagement=false restriction. This occurs due to incomplete enforcement of access control checks on PUT operations to the resource_set endpoint. This issue enables unauthorized modification of protected resources, impacting data integrity.

EPSS: 0.002 (10.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-4628?: CVE-2026-4628 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Improper Access Control. CVSS score: 4.3/10. Published 2026-03-23.
How severe is CVE-2026-4628?: Medium severity. CVSS v3 base score is 4.3 out of 10.